In order to meet these requirements, geothermal heat pumps with water-circuit change over WSH-XEE 40.2 with 143 kW each with high seasonal efficiency were installed, supplied by Thercon and installed by HVAC Theo Boons installation company.
Guido Hendrickx, business development manager at Clivet distributor Thercon Belgium, explains. "The three blocks of flats are equipped with a geothermal heat pump, underfloor heating and high thermal insulation.
The WSH-XEE 40.2 geothermal heat pumps with water-circuit change over produces energy for heating in winter and cooling in summer by exploiting groundwater through wells drilled to a depth of 150 m. In summer, the Natural cooling function is used, utilising groundwater to cover the cooling needs of the flats without using the heat pump. 
To maximise the efficiency of the system, the water temperature for underfloor heating is set at 35°C.
Domestic hot water is produced separately in each flat with water-to-water heat pumps using the Clivet heat pump as the source.